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td5 air in fuel system

P

pjlh28

In Second Gear
Please help.
New to this forum
My disco seems to die due to fuel starvation after running for 10 mins and will not start unless you reprime the system. Its been at the garage now for 2 weeks had a
new fuel pump
fuel filter housing
fuel pressure regulator
and still no joy. There now appears to be air in the fuel as it is leaving the fuel cooler.
They have ran a pipe directly from the fuel cooler to the tank by passing the filter and this seems to
have solved the problem the engine does not die.They now believe its a cracked head however we have been told if the head was cracked there would be fuel in the oil and there is not.

has anyone got any ideas
 
Did they check the copper washers on the injectors? If they are leaking(and they do sometimes) there will be combustion air in the fuell rail and the engine will stop after 5 to 10 minutes.
If the head has a crack in the fuel rail your oil level will rise.

Best advice is to renew the seals and the washers on the injectors.

Be aware that when removing the first injector all the fuel will run in to the cilinder. That has to be removed other wise you might damage your engine when starting due to diesel lock.
 
Thanks
The injectors were replaced about 18months ago, would they go again so soon?
Is there any other signs to look for that would confirm it is the copper washers?
 
TD5 2002 noisy fuel pump and air in system Hi, we have just bought a TD5. On driving it home, it seemed OK at first, but then we noticed a smell of diesel. We found it was the fuel pressure regulator leaking (3 pipe), which we have replaced with a genuine new part. We have given the whole vehicle a service, including changing the fuel filter, oil filter, air etc. Drove to MOT test centre, and was running lumpy. It failed! On taking it for the retest on Saturday, going up a steep hill it was missing a beat and eventually lost power completely. I had to be towed back. Then we discovered the purging sequence of the diesel, all fired up, lot of smoke as expected from that. Now pump is very noisy i.e. you can hear air circulating through it. I have identified the pipe at the pump and filter end being low pressure return pipe where I can hear air (using a long screwdriver with my ear to it!). I cannot hear anything up at the engine end. I think I have all the obvious things, but would be very grateful for any ideas as to how to solve the problem. What makes the pressure relief valve go wrong to start with as it seems to be a common problem? HELP! Other car going Thursday so need to fix it before then so the wife can use it or she will kill me!!!!
 
I have much the same problem. Pump started to make a noise then vehicle became hard to START, now vehicle stops and needs purging. Runs well when going and still pulls 2.8 ton caravan. Mechanic I think is guessing and now wants to replace fuel pump. I still think it is injector seals. Any other ideas.
 
The main issues with "air" in the fuel can be:

Fuel pressure regulator. But it would be leaking. Rear R/H of engine block.

Injector seals. Manifests itself by running for a few minutes and idling quite happily but then extra pressure of normal driving blows exhaust gas into fuel rail. Engine will then stop through lack of fuel. Re-prime system and it will restart & run for a few minutes before stopping again. Mine did this and one of the symptoms was that the exhaust also smelled strongly at idle. Cost about £250. Gradually gets worse with time to the point where the engine will stop every mile or so.

Fuel pump failure. Similar but will generally pack in after a few minutes of foot down driving. May stutter and then pick up if you slow to idle. Cost about £200.

Leaking fuel filter housing. Should be visible. £180. Or blocked non-return valves. cost about £30.

Worst case, cracked head. Usually across an injector port. Gas blowing into fuel rail under pressure. Cost £1200-£1500.

My money would be on the copper seals, and this is where I would start. Not an easy DIY job unless you are used to handling injectors and have an injector puller. (Others on this site may disagree). Breaking an injector will cost you £350 per injector and hope you don't get it jammed in the head. There are companies which specialise in just removing injectors and will do it at your home address!

Hiope this info helps.
 
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